{
  "subject": "GRB 261007A: SVOM/GRM observation",
  "createdOn": 1791474395682,
  "circularId": 45863,
  "format": "text/plain",
  "eventType": [
    "GRB",
    "X-ray Transient"
  ],
  "body": "SVOM/GRM team: Yang-Zhao Ren, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)\n\nSVOM/ECLAIRs team: Olivier Godet (IRAP)\nReport on behalf of the SVOM team:\n\nSVOM/GRM was triggered in-flight by GRB 261007A (SVOM trigger reference: sb26100701) at 2026-10-07T05:39:49.800 UTC (T0), which is also detected by SVOM/ECLAIRs (Hatsune Goto et. al., GCN #45824), EP (Wen et. al., GCN #45828), Fermi/GBM (Fermi GBM team, GCN #45830), NuSTAR (Waratkar et. al., GCN #45846) and AstroSat/CZTI (Harsha et. al., GCN #45859).\n\nWith the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a T90 of 25.0 +0.5/-0.5 s in the 15-5000 keV band.\n\nThe SVOM/GRM light curve can be found here:\nhttps://www.bursthub.cn/gcn/2026/svgrb261007A.png\n\nIn addition, the position of this burst, as determined by SVOM/ECLAIRs (RA= 11.5787 deg, Dec=-17.6698 deg, ERR= 9.61 arcmin, GCN #45824), is located at about 28 degrees from the SVOM optical axis.\n\nWith this localization, the time-averaged spectrum from T0 to T0+30 s is best fitted by a power law function with an exponential high-energy cutoff. The power law index is -0.66 +0.02/-0.02 and the cutoff energy, parameterized as Epeak, is 316 +8/-7 keV. The event fluence (10-1000 keV) in this time interval is (8.54 +0.13/-0.12)E-05 erg/cm^2.\n\nThe 1s peak spectrum, measured from T0+21.7 to T0+22.7 s, if fitted by a power law function with an exponential high-energy cutoff, the power law index is -0.59 +0.03/-0.03 and the cutoff energy, parameterized as Epeak, is 322 +14/-13 keV. The flux (10-1000 keV) in this time interval is (2.85 +0.05/-0.04)E-06 erg/cm^2/s.\n\nThe localization of GRB 261007A in the 'Amati' relation diagram is shown at: \nhttps://www.bursthub.cn/gcn/2026/svgrb261007A_amati.png\nThe localization of GRB 261007A in the 'Yonetoku' relation diagram is shown at: \nhttps://www.bursthub.cn/gcn/2026/svgrb261007A_yonetoku.png \n\nThe Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS.\n\nThe SVOM point of contact for this burst is: Yang-Zhao Ren (IHEP)(renyz@ihep.ac.cn)",
  "submitter": "renyz16607@163.com",
  "eventId": "GRB 261007A",
  "submittedHow": "web"
}